noun-modifying (irregular)
postpaid; deferred-payment
Used attributively for services where payment occurs after use, especially mobile phone plans. Contrasts with プリペイド (prepaid).
wasei-eigo (Japanese-coined English), from postpaid
See also: プリペイド
ポストペイドの携帯電話プランを契約した。
I signed up for a postpaid mobile phone plan.
プリペイド means prepaid, where payment is made in advance, while ポストペイド is postpaid, where payment occurs after usage.
Wasei-eigo derived from English 'postpaid', used in Japanese to describe deferred-payment services.